Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories
Dissolved organic matter (DOM) in mountain glaciers is an important source of carbon for downstream aquatic systems, and its impact is expected to increase due to the increased melting rate of glaciers. We present a comprehensive study of Laohugou glacier no. 12 (LHG) at the northern edge of the Tib...
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| Format: | Article |
| Language: | English |
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Cambridge University Press
2018-12-01
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| Series: | Annals of Glaciology |
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| Online Access: | https://www.cambridge.org/core/product/identifier/S0260305518000204/type/journal_article |
| _version_ | 1811157264880369664 |
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| author | Lin Feng Yanqing An Jianzhong Xu Shichang Kang |
| author_facet | Lin Feng Yanqing An Jianzhong Xu Shichang Kang |
| author_sort | Lin Feng |
| collection | DOAJ |
| description | Dissolved organic matter (DOM) in mountain glaciers is an important source of carbon for downstream aquatic systems, and its impact is expected to increase due to the increased melting rate of glaciers. We present a comprehensive study of Laohugou glacier no. 12 (LHG) at the northern edge of the Tibetan Plateau to characterize the DOM composition and sources by analyzing surface fresh snow, granular ice samples, and snow pit samples which covered a whole year cycle of 2014/15. Excitation–emission matrix fluorescence spectroscopy analysis of the DOM with parallel factor analysis (EEM-PARAFAC) identified four components, including a microbially humic-like component (C1), two protein-like components (C2 and C3) and a terrestrial humic-like component (C4). The use of Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) showed that DOM from all these samples was dominated by CHO and CHON molecular formulas, mainly corresponding to lipids and aliphatic/proteins compounds, reflecting the presence of significant amounts of microbially derived and/or deposited biogenic DOM. The molecular compositions of DOM showed more CHON compounds in granular ice than in fresh snow, likely suggesting newly formed DOM from microbes during snowmelting. |
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| format | Article |
| id | doaj.art-00a865c77bbc4461a4bfa8e6297ee5a2 |
| institution | Directory Open Access Journal |
| issn | 0260-3055 1727-5644 |
| language | English |
| last_indexed | 2024-04-10T05:04:22Z |
| publishDate | 2018-12-01 |
| publisher | Cambridge University Press |
| record_format | Article |
| series | Annals of Glaciology |
| spelling | doaj.art-00a865c77bbc4461a4bfa8e6297ee5a22023-03-09T12:27:35ZengCambridge University PressAnnals of Glaciology0260-30551727-56442018-12-0159314010.1017/aog.2018.20Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categoriesLin Feng0https://orcid.org/0000-0003-4605-535XYanqing An1Jianzhong Xu2https://orcid.org/0000-0002-9933-1744Shichang Kang3State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences (CAS), Lanzhou 730000, China. E-mail: University of Chinese Academy of Sciences, Beijing 100049, ChinaState Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences (CAS), Lanzhou 730000, China. E-mail:State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences (CAS), Lanzhou 730000, China. E-mail:State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences (CAS), Lanzhou 730000, China. E-mail: CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, ChinaDissolved organic matter (DOM) in mountain glaciers is an important source of carbon for downstream aquatic systems, and its impact is expected to increase due to the increased melting rate of glaciers. We present a comprehensive study of Laohugou glacier no. 12 (LHG) at the northern edge of the Tibetan Plateau to characterize the DOM composition and sources by analyzing surface fresh snow, granular ice samples, and snow pit samples which covered a whole year cycle of 2014/15. Excitation–emission matrix fluorescence spectroscopy analysis of the DOM with parallel factor analysis (EEM-PARAFAC) identified four components, including a microbially humic-like component (C1), two protein-like components (C2 and C3) and a terrestrial humic-like component (C4). The use of Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) showed that DOM from all these samples was dominated by CHO and CHON molecular formulas, mainly corresponding to lipids and aliphatic/proteins compounds, reflecting the presence of significant amounts of microbially derived and/or deposited biogenic DOM. The molecular compositions of DOM showed more CHON compounds in granular ice than in fresh snow, likely suggesting newly formed DOM from microbes during snowmelting.https://www.cambridge.org/core/product/identifier/S0260305518000204/type/journal_articlebiogeochemistryglacier chemistrymountain glaciers |
| spellingShingle | Lin Feng Yanqing An Jianzhong Xu Shichang Kang Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories Annals of Glaciology biogeochemistry glacier chemistry mountain glaciers |
| title | Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories |
| title_full | Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories |
| title_fullStr | Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories |
| title_full_unstemmed | Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories |
| title_short | Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories |
| title_sort | characteristics and sources of dissolved organic matter in a glacier in the northern tibetan plateau differences between different snow categories |
| topic | biogeochemistry glacier chemistry mountain glaciers |
| url | https://www.cambridge.org/core/product/identifier/S0260305518000204/type/journal_article |
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